The previews are basically your chapters.. plus a bit more
so in my opinions, it takes away from the actual chapter.
I sort of skim through the actual chapter.
But the trailers are amazing ♥
and honestly, we know you're writing. We know you have a life, and may be busy. Don't worry, we won't bash you or anything for not updating in a while.
So just post when you can, honestly.

I don't really like the idea of previews, cuz it's kinda a spoiler... :/
But it's up to you, and since you are one of my favourite authors, won't mind whatever is your decision :)

i like surprises! don't need both..hahahaha

The trailers are entertaining
The previews get on my nerves because they're just cliffhangers and they leave me wanting to know more.

No previews. I feel like it takes away from the actual chapter once it's out.

Of course yes! Your trailers and previews are awesome!